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People who experience particular side effects after receiving a COVID-19 vaccine, such as swollen lymph nodes, may have previously been infected with the coronavirus, according to a new study published on the medRxiv preprint server. The study hasn’t yet been peer-reviewed.

Common side effects such as fever, fatigue, muscle pain and joint pain were also more common among those who had previous infections.

An earlier COVID-19 infection, but not what’s known as “long-haul COVID-19”’ was associated with increased risk of swollen lymph nodes after receiving the vaccination, the study authors wrote.

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